The invention relates to a method for impregnating, incorporating or surface-treating substances/articles that can be microbially decomposed, contaminated and/or infested with parasites and/or that are perishable. The inventive method comprises the following steps: applying a special antimicrobial/antiparasite composition on the substances/articles or incorporating the antimicrobial/antiparasite composition in the substances. The invention further relates to said special antimicrobial/antiparasite compositions, to their use for impregnating and/or surface-treating substances that can be microbially decomposed, contaminated and/or that are perishable or substances that are infested with parasites and to the use thereof in substances and products that have to be self-contaminating.
